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问题 选择题

海水晒盐的原理（    ）

A．利用热蒸发浓缩海水达饱和并进一步结晶

B．通过降温降低食盐的溶解度使食盐析出

C．利用加入沉淀剂的方法是食盐沉淀析出

D．利用泥沙使海水达到饱和，然后利用日光使食盐析出

答案

答案：A

题目分析：由于食盐的溶解度受温度的影响小，从食盐溶液中获得食盐主要利用蒸发溶剂的方法。故选A。

单项选择题

可燃物质的()越低，就越容易着火。

（A）比热 

（B）蒸发点 

（C）汽化热 

（D）着火点
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填空题

根据括号内的汉语，结合句子的意思，在空格处填上一个形式正确的英语单词。

每个空格只准填一个单词。

1. It's              (不大可能) that people can find South China tigers in the wilds of China.

2. The boy plays the guitar quite well. But he said he              (更喜爱) violin to guitar.

3. The twins look alike but have very different              (性格).

4. He's a shy boy who can't              (沟通) very well.

5. My father              (代表) my family to make a speech at my sister's wedding yesterday.

6. Soon the fire              (散播) to the edge of the forest.

7. Can you tell me the exact              (长) of the Great wall?

8. The              (辩论) lasted until late into the night.

9. She looks              (昏昏欲睡). Where did she go last night?

10. The small house was badly              (损害) in the heavy rain.

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